Realization of thermal opaque membranes in SdS Spacetime: Concept of thermal opaque membrane has been vastly used in literature to study the one horizon and take another one as the boundary, e.g. [1]}, [2]}, [3]}, [4]} and the references therein. We illustrate the proposal given in [5]} of the practical realisation of thermal opaque membrane or thermal opaque membrane. The Klein-Gordon equation in \(3+1\) -dimensions, with the radial function have the following form
\(\left(-\frac{\partial ^2}{\partial t^2}+\frac{\partial ^2}{\partial r_{\star }^2} \right)R(r)+\left(1-\frac{2M}{r}-\frac{\Lambda r^2}{3} \right)\left(\frac{l(l+1)}{r^2} +\frac{2M}{r^3} -\frac{\Lambda }{3} \right) R(r)=0\) 
